Exercise device



FIG. 1 is a perspective view showing my new design for an exercise device;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view, both side elevational views being identical;

FIG. 4 is a side elevational view rotated 45 degrees; and,

FIG. 5 is a rear elevation view thereof. 

The ornamental design for an exercise device, as shown and described. 